add fuzzy string match support for Programs plugin

Wox.Infrastructure/FuzzyMatcher.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace Wox.Infrastructure
+{
+    //From:http://crossplatform.net/sublime-text-ctrl-p-fuzzy-matching-in-python/
+    public class FuzzyMatcher
+    {
+        private Regex reg = null;
+        private string rawQuery = "";
+
+        private FuzzyMatcher(string query)
+        {
+            this.rawQuery = query;
+            this.reg = GetPattern(query);
+        }
+
+        private Regex GetPattern(string query)
+        {
+            var pattern = string.Join(".*?", query.ToCharArray().Select(x => Regex.Escape(x.ToString())).ToArray());
+            return new Regex(pattern, RegexOptions.IgnoreCase);
+        }
+
+        public int Score(string str)
+        {
+            var match = reg.Match(str);
+            if (!match.Success)
+                return 0;
+
+            //a match found near the beginning of a string is scored more than a match found near the end
+            //a match is scored more if the characters in the patterns are closer to each other, while the score is lower if they are more spread out
+            var score = 100 * (this.rawQuery.Length + 1) / ((1 + match.Index) + (match.Length + 1));
+            //a match with less characters assigning more weights
+            if (str.Length - this.rawQuery.Length < 5)
+                score = score + 20;
+            else if (str.Length - this.rawQuery.Length < 10)
+                score = score + 10;
+
+            return score;
+        }
+
+        public static FuzzyMatcher Create(string query)
+        {
+            return new FuzzyMatcher(query);
+        }
+    }
+}

Wox.Infrastructure/Wox.Infrastructure.csproj

@@ -49,6 +49,7 @@
   <ItemGroup>
     <Compile Include="ChineseToPinYin.cs" />
     <Compile Include="CommonStorage.cs" />
+    <Compile Include="FuzzyMatcher.cs" />
     <Compile Include="IniParser.cs" />
     <Compile Include="UAC.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />